Respirator bag and assembly



July 23, 1935. l H, F sH|NDEL 2,009,073

RESPIRATOR BAG AND ASSEMBLY Filed Oct. 22, 1952 nventor (Itfornega Patented July 23, 1935 UNITED STATES PATENT OFFICE RESPIRATOR BAG AND ASSEMBLY` Application October Z2, 1932, Serial No. 639,026 4 claims. (C1. 12s-14e) This invention relates to respirators and particularly to a'n improved respirator bag of novel construction and also to improvements in the general construction and assembly of such respirators.

In many instances the lter bags of respirators are of cumbersome construction and partially obstruct the vision of a wearer above and at the sides of the bag. An object of the present invention is to provide a respirator bag of simple construction adapted to be associated with the other parts of a respirator in such manner as not to obstruct the vision of a wearer. Another object is to provide a respirator in which a maximum I 1 amount of its surface is effective to iilter air breathed by a wearer. A further object is to improve the respirator construction so as to eliminate undesired ingress and .egress of air at certain points thereof.

Other objects and advantages of the invention will be apparent upon consideration of the following detailed description of an illustrative embodiment of the invention when read in conjunction with the appended claims and the accompanying drawing in which: l

Figure 1 is a plan view oi' a respirator embodying the invention with some parts broken away and others shown in section to illustrate details of construction; v 3o Figure 2 is a side View of the lter bag and associated parts of the respirator; and

Figure 3 is a perspective viewpof an expander for the respirator bag.

In the drawing, the numeral I0 designates a o mask of suitable material and construction adapted to be applied over the nose and mouth of a wearer so that the air breathed by the -wearer is drawn in through a respirator bag II and exhaled through the mask outlet I2. Mask I0 ex- 40 tends at one end through a suitable opening in an end wall of a mask ring or casing I3 which may comprise a pair of interengaged screw caps I4 and I5.

The mask I0 is provided with a suitable ange I6 overlying and held in engagement with the interior surface of the end wall of cap I 4 by a peripheral iiange I'I on a valve plate or disc I8 formed with apertures 2l) for the passage of airv from bag II and provided with a one way flap valve 2l. A peripheral flange 22 extending from the opposite side of disc I8 binds a ange 23 on the outlet. 24 of bag II against the interior surface of the end wall of cap I5 which is formed with an opening through which the bag outlet ex- 55 tends into the casing so that the ange '23overlies the said wall. With the above described arrangement the anges I'I and 22 on disc I8 by binding the anges'lt, 23 of the mask and bag, respectively, against the end walls-oic casing I3 enclose and seal the passage interiorly of casing 5 I3 through which air is drawn tothe mask from the respirator bag. I

According to the present invention the respirator bag II comprises a pair of similar discs 25 of suitable material, for example afabric such as wool felt, laid together and joined as by stitch. ing, cementing, or the like, along the major part of their circumferential edges. Each disc is provided with a preferably integral extension 26 the upper .edge 21 of which is tangential to the periphery of the respective disc at 'its top and hence parallel to the center line thereof. The widths of the extended portions 26are preferably such that their lower edges 28 are disposed above the center lines of the respective discs and may also be parallel to-the edges ZIthereof so that when the extended portions of the discs are secured together alon'g" their side edges 21 and 28 a substantially cylindrical outlet is provided for the bag Il. The attaching-flange 23 may be integral with the outlet 24 orgi'nay comprise an annulus of suitable material vattached at its inner peripheral edge to the outlet-vier example by providingit with an upstanding flangesuitably secured to the wall of the outlet as indicated in Fig. 1.

It may be noted that the outlet 24 is disposed above the center of the bag with its upper side tangential to the upper part of bag II and when attached to ring I3 causes the bag to extend forwardly and downwardly so that the upper part of the bag doesnot obstruct the Wearers vision. The outer-end wall portions of outlet 24 which merge into the substantially circular sides of the bag are convergent and thuscausev the latter to be disposed centrally of the ringV I3. As the bag is a relatively thin disk-like cylinder disposed vertically edgewise centrally of ring i3 the wear-y ers vision is not obstructed by the sides of the bag, and in fact all of the latter is practically invisible to a wearer.

In order that the respirator bag of the invention may perform its functions properly a novel expander 30 is provided for preventing collapsing of the sides of the bag due to the breathing ac- 50 tion or otherwise. The expander l30 comprises a preferably continuous wire loop bent into an arcuate form and having its branches extending adjacent each other.

As shown in Figs. 1 and 3, in which the exponents a and b designate the respective branches, the loop 30 is reversely bent at a plurality of points so that portions 3| of each branch of the loop are oiset alternately atopposite sides of the center line of the loop and are disposed substantially parallel to similarly offset portions of the other branch; and the respective oiset portions are connected to contiguous loop portions by inclined portions 32 thereof which being oppositely inclined in the respective branches intersect each other, substantially on the center line of the loop. When the loop is inserted within the respirator bag I as indicated in Figs. l and 2 the oiset portions 3| contact the sides of the bag and maintain the latter distended so that a maximum amount of its surface is eiective to lter air. Inasmuch as the outlet 24 is of greater Width than the relatively thin substantially ilat sided bag the parallel end portions 33 of the loop are more widely spaced than the side contacting portions 3|.

Although an illustrative embodiment of the invention has been described in detail there are many changes and variations which may be made without departing from the principles of the invention and it is intended to include all such changes and variations Within the scope of the appended claims.

What I claim is:

1. A respirator comprising a face mask having an air inlet with a surrounding attaching flange, a relatively flat adjustably secured respirator bag having an air outlet With a surrounding attaching flange, a pair of connecting clamping caps adapted to receive the respective attaching flanges and peripherally engage them within their annular cap rims, and a flange clamping spacer enclosed by said caps and comprising a disc portion having reversely extending peripheral ilanges engaging opposed peripheral faces of said attaching flanges, said disc having a valve closed aperture controlling the admission of air from said respirator bag to said mask inlet.

2. A respirator comprising a face mask having an air inlet with a surrounding attaching flange, a respirator bag having an air outlet with a surrounding attaching ange, a pair of complementary clamping caps having apertured ends and surrounding rim portions adapted to receive the respective attaching ilanges and peripherally engage them within their cap rims, and a ange engaging spacer ring clampingly seating said attaching anges to their respective clamping cap rims to form an air-tight chamber connecting said face mask inlet and said respirator bag outlet.

3. A respirator comprising a face mask having an air inlet with a surrounding attaching ilange, a respirator bag having an air outlet aperture and a separate at ring annularly secured to said wall adjacent said aperture to form a surrounding attaching ilange, a pair of complementary clamping caps having apertured ends and surrounding rim portions adapted to receive the respective attaching ilanges and peripherally engage them within theircap rims, and a flange engaging spacer ring clampingly seating 'said attaching anges to their respective clamping cap rims to form an air-tight chamber connecting said face mask inlet and said respirator bag outlet.

4. In combination with a respirator mask having a spacing ring forming an air communicating passageway extension from said mask, means for connecting said ring to said mask so as to form an air tight junction therewith, and an endapertured cap having a flange adapted to clampingly engage against the lprojecting end of said ring, of an air lter bag having an air outlet and an apertured flat attaching flange surrounding said outlet and fixedly secured to the surrounding peripheral edge of the latter, said attaching ilange being adapted to be entered through said cap end aperture and clampingly engaged between said ring end and said cap ilange.

HARRY l5'.` SHINDEL. 

